How to select correct materials for cnc machining?

How to select correct materials for cnc machining in China?The material is wrong, everything is in vain!

There are many materials suitable for CNC processing.To find the materials suitable for the product, it is restricted by many factors. A basic principle to be followed is that the performance of the material should meet the technical requirements of the product and the environmental use requirements.When selecting mechanical part materials, the following five aspects can be considered.

1. Whether the rigidity of the material is sufficient

Rigidity is the first factor to be considered when selecting materials, because products need certain stability and wear resistance in actual work, and the rigidity of materials determines the feasibility of product design.According to industry characteristics, 45 steel and aluminum alloy are usually selected for non-standard tooling design; For the tooling design of machining, 45 steel and alloy steel will be used more; Most of the tooling design in the automation industry will choose aluminum alloy.

2. How about material stability

For a product with high accuracy requirements, if it is not stable enough, various deformations will occur after assembly, or it will be deformed again during use. In short, it will be constantly deformed with the change of temperature, humidity, vibration and other environment. This is a nightmare for the product.

3. How about material processing performance

The processing performance of materials means whether the parts are easy to process. Although stainless steel is rust-proof, it is not easy to process. Its hardness is high and it is easy to wear tools during processing. Machining small holes on stainless steel, especially threaded holes, is easy to break the drill bit and tap, which will lead to very high processing costs.

4. Antirust treatment of materials

Antirust treatment is related to the stability and appearance quality of products. For example, 45 steel will usually be treated with “blackening” for rust prevention, or the parts will be painted and sprayed with plastic. It can also be protected with sealing oil or anti-rust fluid during use according to the environmental requirements.There are many anti-rust treatment processes, but if the above methods are not suitable, the material must be replaced, such as stainless steel. In any case, the rust prevention of the product cannot be ignored.

5. How about the material cost

Cost is an important consideration in selecting materials. Titanium alloy has light weight, high specific strength and good corrosion resistance. It is widely used in automobile engine system and plays an inestimable role in energy saving and consumption reduction.Although titanium alloy parts have such excellent performance, the main reason that hinders the universal application of titanium alloy in the automobile industry is the high cost. If it is not really necessary, please choose cheaper materials.

There are many materials suitable for CNC machining in China.The following are some common materials used for machining parts.Surely,if you want to know more details about the cnc machining material in China,you could send rfq to freequote@jevny.com in any time and we get the reply within 2 hours in normal thing.

Metal Materials: Aluminum Alloy,Carbon steel,Stainless steel,M303E (High chrome content steel),Tool steel,Zinc,Brass,Red Copper,Bronze,Titanium Alloy etc.
Plastic Materials:Buff ABS, Black ABS, 94V0 flame retarding ABS, ABS+30%PC, Black Polycarbonate, Transparent Polycarbonate, Acrylic, NYLON 6, NYLON 66, PA6GF30%, POM, PP, PP+20%GF, PE, TEFLON, PPS, PEEK, PPO, PPE, PEI, PAI, PES etc.

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Vacuum Casting VS Reaction Injection Moulding(RIM) for low volume production in China.

Vacuum Casting VS Reaction Injection Moulding(RIM) for low volume production in China.

Vacuum Casting and Reaction Injection Moulding are common manufacturing way for low volume production. The both of making way look similar.Make an master mold by CNC processing or 3D printing.For those with complex structures, make an master model by 3D printing, and then use the master mold to make a silicone mold. Then use the silicone mold to make a batch copy. However, there are some differences between the two methods,Next,we will analyze the difference between the vacuum casting and Reaction Injection Moulding.

1.Vacuum Casting

Vacuum Casting(urethane casting) is a common processing method that uses the master mold to make a slicone mold in vacuum state,and uses PU material to pour in vacuum state, so as to clone the same copy as the original template.It is mainly used for small batch customization of plastic tablets.Generally, dozens to hundreds of plastic tablets are processed in this way,which is cost-effective.

The material performance of vacuum casting products can simulate the performance of most existing engineering materials. Common materials include domestic PU, imported PU, transparent PU, soft PU, POM, ABS, PP, PC high temperature resistant ABS, etc. At the same time, transparent parts such as PC, organic glass, thermoplastic elastomer TPR, TPR, TPU, and various soft materials such as silica gel, rubber, etc. can be copied. At the same time, various colors can be added to the copied products to meet various appearance requirements.Product replication is not affected by volume, complexity, various structures, etc. It is easy to open the mold, short cycle, and quick to take effect.

2.Reaction Injection Moulding (RIM)

RIM,also known as low pressure reaction injection molding, is a new process applied to rapid tooling. It is mainly used to mix two-component polyurethane materials and inject them into rapid tooling under normal temperature and low pressure.Products are formed through chemical and physical processes such as polymerization, cross-linking and curing of materials. The utility model has the advantages of high efficiency, short production cycle and low cost. It is applicable to small batch trial production in the process of product development, as well as the production of small batch panels with simple structure and large thick wall and uneven wall thickness products.

The first to use Reaction Injection Moulding in China is applicable to the automobile industry.In recent years,the domestic medical product manufacturing and instrument manufacturing use relatively more reaction injection moulding technology.Because the number of instruments and medical products produced is not large, the annual sales of a product is tens of hundreds of sets, If the injection cost of steel mold is relatively high, and there are many medical products, the wall thickness is relatively thick, or the wall thickness is uneven, which is not suitable for the injection molding process, the surface surface is complex, and it is not suitable for the blistering process, but the low pressure injection is different.Thick wall products can be poured, and the wall thickness can be uneven products.The normal pouring wall thickness (5-6mm) can be about 30mm at most, There are many materials used for molds (including aluminum mold, resin mold, plastic mold, gypsum mold, etc.). There are many injection materials, including imported materials, domestic materials, materials close to ABS, and materials close to pp.

Summary of differences: vacuum casting is mainly used to copy small prototype in small batches (such as ABS, PC, acrylic prototype, etc.), while Reaction Injection Moulding(RIM) way is used to copy large prototypes, such as car bumpers, medical instrument case shells, instrument panel handboards, etc.

CNC Machined Aluminum Battery Cases for Electric Vehicles(EV)

CNC Machined Aluminum Battery Cases for Electric Vehicles(EV).

Jevny Technology has been focusing on cnc machining for 20 years.Jevny has 100 sets CNC machining centers and provide all kinds of cnc machining and friction stir welding for custom Electric Vehicles(EV)Battery Cases,EV Battery Enclosure,EV Battery Tray and EV Battery Housing manufacturing.We have been working hard for many years and have accumulated rich technical experience in this field.Whether it is flatness, smoothness,roughness,tolerance,accuracy of thread tapping depth,relative position of threaded holes,and air tightness,it can meet the needs of users.It is your preferred Electric Vehicles Cases customization manufacturer in China.

There are some processing process as below for Electric Vehicles Battery cases machining as for your reference.

1.CNC Programming:The programming engineer performs programming according to the 3D drawings provided by the customer,and writes the programming language for controlling the CNC machining center at Jevny rapid manufacturer.

2.CNC Milling:Jevny chooses a horizontal machining center to customize the Electric Vehicles Battery Cases.It is good at hexahedron machining, with high efficiency and high precision,which greatly saves the production cost.Under the instruction of the program,carve off the excess part of the surface of the material to obtain the approximate shape of the Battery Cases prototype.

3.Grinding: When the Electric Vehicles Battery cases is out of the CNC machining center, there will be some burrs and tool marks on the surface, which need to be ground off with sandpaper. When it is grinding,use coarse sandpaper first,and then use fine sandpaper,so that the polished new EV cases is relatively fine, and the roughness can reach Ra1.6, which meets the customer’s heat dissipation requirements.

4.Friction Stir Welding:In order to achieve the heat dissipation effect of the EV Battery Enclosure,the friction stir welding process is generally used to make the waterway.The fully sealed waterway processing design,the waterway sealing pressure bearing capacity can reach 0.6 MPa.

5.Surface Finishing:The surface of the EV Battery Housing is anodized to form a film,which is convenient for anti-corrosion and cleaning.

Anyway,if have any RFQ for EV Battery Cases,Enclosure,Cover parts that need to be made by cnc machining,please send RFQ to mail freequote@jevny.com so that you could get the quote within 2 hours.